[tedwards]

I built a homemade computer with these specs (all new):

Power Supply: BFG GS-550 (550W EPS12V),
CPU: Core 2 Duo E8400 (3.0 GHz)
CPU cooler: Freezer 7 pro
Motherboard: Gigabyte GA-EP45-UD3P (P45)
Memory: OCZ Platinum PC2-8500 2x1-GB
Video Card: Radeon HD 4850 512MB

When I turned it on, the fans powered up for 2 seconds, then it beeped once and turned off.
Now, it does the same thing without the beep.

The monitor does not detect a cable either.

I rechecked all the cables, checked the cpu cooler, have the bare minimum components connected, and I checked to make sure the mobo wasn't short-circuiting.

what else could be wrong?

Edited by tedwards, 03 October 2009 - 06:24 PM.

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I checked to make sure the mobo wasn't short-circuiting.

Did you try running the system out of the case? The stand-offs are installed right?

Look at your manual for beep codes: it should tell you what 1 beep means.
Try running with only 1 RAM stick and swap for the one if no go. Make sure your RAM in dual-channel is in the right slots (should tell in manual)

Try clearing your CMOS. Either remove the CMOS battery for about 30 minutes and then put it back in... or there should be a clear CMOS jumper on your mobo (look at manual).

[edge2022]

I checked to make sure the mobo wasn't short-circuiting.

Did you try running the system out of the case? The stand-offs are installed right?

Look at your manual for beep codes: it should tell you what 1 beep means.
Try running with only 1 RAM stick and swap for the one if no go. Make sure your RAM in dual-channel is in the right slots (should tell in manual)

Try clearing your CMOS. Either remove the CMOS battery for about 30 minutes and then put it back in... or there should be a clear CMOS jumper on your mobo (look at manual).

[tedwards]

The stand-offs are installed correctly: they all align with corresponding holes on the mobo, they all stand vertically, and are snugly screwed to the side of the case. That said, I have not tried running it out of the case, though I don't see how that would help if it isn't being shorted in the first case.

1 beep means system boots correctly (not helpful since bios doesn't show up),
I cleared the CMOS, removing the battery and shorting the CMOS jumper. According to the manual, if there was a problem here, I should be getting two short beeps.
I did try two DDR2 rams at 1 time, then either singularly.

Upon a radical suggestion, I even removed the video card to see if that was the problem; but no.

All generated the same situation.

more specifics: the cpu fan merely twitches (although connected to the cpu fan pins), all 6 phase LEDs light up, and the computer continues to cycle between on and off.

Edited by tedwards, 04 October 2009 - 03:45 AM.

[edge2022]

In this case, did you try to call Gigabyte? This might be a board-specific problem, and the mobo might be bad.

[Troy]

Do you have any other parts you are able to access for swap-testing?

[tedwards]

Unfortunately, I have no other compatible parts available to test in this computer.
All my other computers are 6+ years old.
I'm going to try and contact Gigabyte, and see how that goes.

[edge2022]

Ok then. I am not too sure about Gigabyte's tech support, I have never dealt with the before but they seem good.

[tedwards]

Well, they were good, but not good enough.
Without swap-testing, they can't be sure what the problem is.

All I know now is that with the atx 12v unplugged, the computer stays on.
We never could get the heatsink fan to get going. Oddly, the fan would only turn on as I switched the computer off.

[edge2022]

All I know now is that with the atx 12v unplugged, the computer stays on.

You mean the 4/8 pin cable from your PSU?
The problem here might be because of the PSU... try getting another one from a friend and see if it works.

If the CPU heatsink fan is not running don't even leave your computer running as the CPU will quickly gather heat and may damage itself.

Ask Gigabyte if you can request a replacement.

EDIT: Did you try the stock heatsink?

Edited by edge2022, 07 October 2009 - 11:20 PM.